Comprehensive studies of global greenhouse gas cycles in the atmosphere, terrestrial biosphere and oceans

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The concentrations and isotopic ratios of CO_2, CH_4 and N_2O, as well as the O_2 concentration, were measured using ground-fixed stations, aircraft, ships and scientific balloons, and global pictures of their temporal and spatial variations were obtained. By analyzing the observed results using newly developed atmospheric transport models, the variations of the three gases were closely examined and their global cycles were quantitatively evaluated. The concentrations of atmospheric CO_2, CH_4 and N_2O over the last 700 kyrs were reconstructed by analyzing the Dome-Fuji deep ice core from Antarctica, and their variations were interpreted.